!!!BEFORE YOU GO ON TO THE DESCRIPTION: IF YOU HAVE LOTS OF VARIOUS ADDONS INSTALLED, YOU WILL MOST LIKELY EXPERIENCE THOSE ADDONS CONFLICTING.PLEASE, REMOVE ALL ADDONS THAT CONFLICT WITH THIS ADDON. (I do not know which are they, because I develop these SWEPs on a nearly vanilla GMod)YOU'RE NOT SUPPOSED TO USE THESE IN GMOD 13 - THEY HAVE NO OFFICIAL SUPPORT YET AND ARE PRETTY MUCH BROKEN IN GMOD 13.!!!YOU CAN GET Extra Customizable Weaponry 1.12 HERE:http://www.solidfiles.com/d/6a5e469c2a/http://filesmelt.com/dl/Extra_Customizable_Weaponry_1.12_.zip1.25:+ Added physical bullets FOR SINGLEPLAYER:* Each caliber has it's own muzzle velocity* Bullets drop during their flight* The bullets can penetrate surfaces, and still retain their physical state, but have their damage cut in half and can't penetrate anything else* After a bullet penetrates a surface, it's direction will change* The reason why the physical bullets are single-player only is because I can't figure out a proper way to predict them on the client in multiplayer+ Added bipods:* as soon as you equip it, walk up to a waist-high wall and stand still, it will decrease recoil by 70% when aiming and by 60% when not aiming* it will also increase hip fire accuracy when not aiming* a deployed bipod will slightly decrease mouse sensitivity* supports (stock weapons): FAMAS, Galil, M249, SIG SG 552; Extra pack: G3, M14, G36C, HK416, L85A2, M16A2, M249 SAW, M4A1, LR300, SIG SG 551+ Added near wall+ Weapons now take 0.35 sec to holster+ Added attachment icons to the download list, so people won't have purple&black when they go to customize their weapon/\ Fixed the attachment menu not working correctly in multiplayer with lots of people/\ Fixed some weapons that are suppressed by default being too loud/\ Fixed various Lua errors/\ Fixed attempting to load a shotgun with slug ammo giving a Lua error/\ Fixed AK-47's (stock one) ACOG aiming position b

This download looks like an addon. You need to extract the downloaded zip and put the addon folder in your Garry's Mod addons folder. You should end up with a directory structure similar to below: